US4715265A - Process and apparatus for vibratory operation of a working piston, in particular for active working tools - Google Patents

Process and apparatus for vibratory operation of a working piston, in particular for active working tools Download PDF

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US4715265A
US4715265A US06/717,230 US71723085A US4715265A US 4715265 A US4715265 A US 4715265A US 71723085 A US71723085 A US 71723085A US 4715265 A US4715265 A US 4715265A
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Prior art keywords
piston
cylinder
control device
pressure fluid
bucket
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US06/717,230
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Achim Graul
Elmar Niedermeier
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ACHIM GRAUL WITTELBACHERSTRASSE 42 8070 INGOLSTADT GERMANY
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Assigned to ACHIM GRAUL, WITTELBACHERSTRASSE 42, 8070 INGOLSTADT, GERMANY reassignment ACHIM GRAUL, WITTELBACHERSTRASSE 42, 8070 INGOLSTADT, GERMANY ASSIGNMENT OF ASSIGNORS INTEREST. Assignors: GRAUL, ACHIM, NIEDERMEIER, ELMAR
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Classifications

    • E—FIXED CONSTRUCTIONS
    • E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
    • E02F—DREDGING; SOIL-SHIFTING
    • E02F9/00—Component parts of dredgers or soil-shifting machines, not restricted to one of the kinds covered by groups E02F3/00 - E02F7/00
    • E02F9/20—Drives; Control devices
    • E02F9/22—Hydraulic or pneumatic drives
    • E02F9/2203—Arrangements for controlling the attitude of actuators, e.g. speed, floating function
    • E02F9/221—Arrangements for controlling the attitude of actuators, e.g. speed, floating function for generating actuator vibration
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B06—GENERATING OR TRANSMITTING MECHANICAL VIBRATIONS IN GENERAL
    • B06B—METHODS OR APPARATUS FOR GENERATING OR TRANSMITTING MECHANICAL VIBRATIONS OF INFRASONIC, SONIC, OR ULTRASONIC FREQUENCY, e.g. FOR PERFORMING MECHANICAL WORK IN GENERAL
    • B06B1/00—Methods or apparatus for generating mechanical vibrations of infrasonic, sonic, or ultrasonic frequency
    • B06B1/18—Methods or apparatus for generating mechanical vibrations of infrasonic, sonic, or ultrasonic frequency wherein the vibrator is actuated by pressure fluid
    • B06B1/183—Methods or apparatus for generating mechanical vibrations of infrasonic, sonic, or ultrasonic frequency wherein the vibrator is actuated by pressure fluid operating with reciprocating masses
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B25—HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
    • B25D—PERCUSSIVE TOOLS
    • B25D9/00—Portable percussive tools with fluid-pressure drive, i.e. driven directly by fluids, e.g. having several percussive tool bits operated simultaneously
    • B25D9/06—Means for driving the impulse member
    • B25D9/12—Means for driving the impulse member comprising a built-in liquid motor, i.e. the tool being driven by hydraulic pressure
    • E—FIXED CONSTRUCTIONS
    • E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
    • E02F—DREDGING; SOIL-SHIFTING
    • E02F3/00—Dredgers; Soil-shifting machines
    • E02F3/04—Dredgers; Soil-shifting machines mechanically-driven
    • E02F3/28—Dredgers; Soil-shifting machines mechanically-driven with digging tools mounted on a dipper- or bucket-arm, i.e. there is either one arm or a pair of arms, e.g. dippers, buckets
    • E02F3/36—Component parts
    • E02F3/40—Dippers; Buckets ; Grab devices, e.g. manufacturing processes for buckets, form, geometry or material of buckets
    • E02F3/402—Dippers; Buckets ; Grab devices, e.g. manufacturing processes for buckets, form, geometry or material of buckets with means for facilitating the loading thereof, e.g. conveyors
    • E02F3/405—Dippers; Buckets ; Grab devices, e.g. manufacturing processes for buckets, form, geometry or material of buckets with means for facilitating the loading thereof, e.g. conveyors using vibrating means
    • E—FIXED CONSTRUCTIONS
    • E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
    • E02F—DREDGING; SOIL-SHIFTING
    • E02F9/00—Component parts of dredgers or soil-shifting machines, not restricted to one of the kinds covered by groups E02F3/00 - E02F7/00
    • E02F9/20—Drives; Control devices
    • E02F9/22—Hydraulic or pneumatic drives
    • E02F9/2217—Hydraulic or pneumatic drives with energy recovery arrangements, e.g. using accumulators, flywheels
    • E—FIXED CONSTRUCTIONS
    • E21—EARTH OR ROCK DRILLING; MINING
    • E21D—SHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
    • E21D9/00—Tunnels or galleries, with or without linings; Methods or apparatus for making thereof; Layout of tunnels or galleries
    • E21D9/01—Methods or apparatus for enlarging or restoring the cross-section of tunnels, e.g. by restoring the floor to its original level
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B21/00—Common features of fluid actuator systems; Fluid-pressure actuator systems or details thereof, not covered by any other group of this subclass
    • F15B21/12—Fluid oscillators or pulse generators
    • F15B21/125—Fluid oscillators or pulse generators by means of a rotating valve

Definitions

  • the invention relates to a process as set forth in the classifying portion of claim 1 and an apparatus as set forth in the classifying portion of claim 3.
  • Pulse-hydraulic processes and apparatuses of that kind are used in particular for operating the working tools in earth moving equipment such as for example total output-controlled excavators, skimmers, loaders and the like. Due to the vibratory movement of the tools, they can dig relatively easily into kinds of ground which are difficult to deal with. Particularly when dealing with chemically compacted or consolidated sands and shingles, hard coal and brown coal, coral, chalk, bedded limestone and in heterogeneous or weathered hard rocks, it is possible to use smaller working machines than was hitherto usual, as the degree of operating efficiency thereof is substantially enhanced by virtue of the pulse hydraulic arrangement.
  • DE-A No. 22 36 381 discloses a grab-type or loading shovel of an earth moving appliance, which at its forward edge has movably mounted teeth to which hydraulic actuating means are connected.
  • the hydraulic actuating means are operated in a vibratory mode. In that arrangement, the teeth perform a shears-like movement. That shovel is suited primarily for operating in loamy or clayey grounds.
  • DE-C No. 19 57 469 discloses a pulse hydraulic means which can be used for vibratory operation of a working piston. That arrangement comprises a piston which is acted upon on both sides, in a cylinder. The two cylinder chambers in front of and behind the piston are connected to a control device which in its interior has a constantly rotating control slider which in a constantly changing sequence connects on the one hand the return conduit and on the other hand the feed conduit to the hydraulic cylinder, thereby causing a vibratory movement of the piston in the cylinder.
  • the pulse frequency is altered in that arrangement by a change in the speed of rotation of the rotating control piston in the control device.
  • the pressure fluid can additionally be fed to the cylinder in different amounts, thereby making it possible to produce a vibratory sliding movement of the piston.
  • AT-A No. 368 607 discloses a similar apparatus wherein the piston is acted upon, only on one side.
  • the piston is slidable in the cylinder against the force of a spring which, when the control device is in the appropriate position, produces a respective return movement of the piston.
  • that arrangement has a control device in the form of a rotary control piston which is also axially slidable for the purposes of controlling the amount of pressure fluid used.
  • a problem of the present invention is to provide a process and an apparatus of the kind set forth in the opening part of this specification, wherein the known disadvantages are avoided and wherein a tool which operates in a vibratory mode can be provided at minimum expenditure.
  • Another problem of the present invention is to use a pulse-hydraulic apparatus in the optimum fashion in an earth moving appliance such as for example an excavator.
  • the piston is returned by the reaction forces on the tool permits the cylinder to be of a particularly simple design. Because of that, the piston only needs to be subjected to the effect of pressure fluid on one side thereof, without an additional return means being required at the back of the piston. If the feed of pressure fluid from the control device to the cylinder or the discharge of pressure fluid from the cylinder to the control device respectively is effected by way of separate conduits, a pemanent interchange in respect of the pressure fluid may occur, in a particularly advantageous manner. As a result of that, the temperature of the pressure fluid rises only slightly, which has a positive effect on the resistance to aging.
  • the above-specified problems are solved with an apparatus comprising the features recited in the characterising portion of claim 3.
  • the pressure fluid is circulated in the working chamber of the cylinder, by way of the feed line and the return line.
  • reaction forces at the working tool are used for the purposes of the return movement of the piston, the return force is not controllable in every situation. Therefore, the maximum working stroke movement of the piston must be so restricted that no damaging pressure peaks or impacts can act on the piston. That is achieved in a particularly simple manner by means of the relief opening on the cylinder.
  • pressure fluid can escape from the cylinder, by-passing the control device, so that there is no longer any thrust force being applied to the piston.
  • the feed conduit and the return conduit between the control device and the cylinder are communicatingly interconnected independently of the position of the piston, by way of the cylinder. That communication between the two conduits means that the volume of pressure fluid in the conduits can be used as a hydraulic damper as soon as the control device closes off the return conduit.
  • the pressure fluid is compressed by the return force, thereby avoiding a pressure peak which occurs in a shock-like manner, in the system.
  • the compressed pressure fluid serves as a means for accelerating the piston for the reversal of the movement thereof, as soon as the control device opens the feed conduit.
  • the efficiency levels of the apparatus can be further optimized if the return conduit is throttled for the purposes of building up a pressure in the cylinder. In that way, a feed pressure which causes a forward movement of the piston is built up in the working chamber of the cylinder, independently of the constantly fluctuating external conditions such as for example the amount of pressure fluid, the temperature of the pressure fluid, the return force and so on.
  • the relief opening in the cylinder can be exposed only against the resistance of the damping means, that provides in a particularly simple manner that the piston also vibrates when reaching its maximum piston stroke motion.
  • the piston exposes the relief opening, even when the return conduit is closed, there is a drop in pressure in the cylinder so that, even when there is no return force, the piston is returned by the damping means so that the relief opening is closed off again.
  • the damping means is compressed again or the relief opening is opened, so that the procedure is repeated.
  • the damping means comprising two disc members which are loosely mounted on a reduced-diameter portion of the piston and between which there is disposed a spring element, wherein the axial movement of each disc member is restricted by an abutment disposed in the cylinder on the side remote from the spring element.
  • the damping action is produced in that way in both directions, by virtue of the same spring element.
  • the damping travel is of a equal magnitude in both directions.
  • the damping travel between the two disc members can be restricted, in that arrangement, by at least one spacer member.
  • An advantageous use of an apparatus as described above, for an excavator bucket with vibratory teeth or tines is characterised in accordance with the invention in that the hydraulic cylinder is flanged directly onto the control device, and the unit comprising the hydraulic cylinder and the control device is arranged in a double bottom structure underneath the bucket.
  • the control device and the hydraulic cylinder being directly assembled together, there are no unnecessary connecting conduits and the pressure pulses can be transmitted to the piston in the cylinder, virtually without pressure losses.
  • That design also gives a short compact construction which can be easily disposed in the double bottom structure of the bucket.
  • the fact that the hydraulic unit is mounted directly on the working tool also means that there are no complicated mechanical force transmission elements such as for example linkage arrangements and the like, which are susceptible to trouble.
  • the excavator bucket itself is of greater mass, by virute of that arrangement, and that can also only have a positive effect, in operation of the assembly.
  • the excavator shovel operates in a particularly advantageous manner when it is provided with a substantially U-shaped mouth assembly whose limb portions are connected at their free ends in the upper region of the bucket, with the connecting portion between the limb portions on the front side thereof forming the cutting edge of the bucket and carrying the teeth, with the connecting portion in turn being pivotally connected to the piston.
  • the teeth to be moved are all jointly secured to the U-shaped mouth assembly, that arrangement avoids complicated individual mounting and guidance for the teeth.
  • the limb portions being pivotally mounted in the upper region of the bucket, the teeth do not perform a rectilinear movement but move over a path which is a portion of a circle.
  • the ground which has been broken out is moved against the shell of the bucket.
  • the design is particularly simple if a plurality of units comprising a hydraulic cylinder and a control device are disposed in a row under the bottom of the bucket, with the control devices being activatable by a common contro shaft.
  • all the control devices perform precisely the same control movement so that the cylinders always vibrate simultaneously at a uniform frequency.
  • FIG. 1 is a diagrammatic view of the hydraulic system comprising the control device and the cylinder,
  • FIG. 2 shows a view in cross-section through a control device with a cylinder flanged thereon, with the piston in the returned position
  • FIG. 3 shows a view in cross-section as shown in FIG. 2, with the piston in the position of reaching the maximum stroke movement thereof,
  • FIG. 4 shows the use of an apparatus according to the invention in an excavator shovel
  • FIG. 5 shows a modified embodiment of a control device.
  • a working piston 15 is movable in a hydraulic cylinder 1.
  • the hydraulic cylinder 1 is connected to a control device 2 by way of a feed conduit 9 and a return conduit 10.
  • the cylinder is supplied with pressure fluid by means of the pump 4 from a pressure fluid tank 3 by way of the section conduit 6 and the pressure conduit 7, the continuation of which, after the control device 2, is the feed conduit 9.
  • a further pressure conduit 8 is a pressure-equalizing storage means or reservoir 5.
  • the hydrostatic pressure fluid flow is converted into a pulsating pressure fluid flow.
  • the control device alternatingly closes and opens the feed conduit 9 and the return conduit 10 respectively. Therefore, when the feed conduit 9 is opened, a hydraulic thrust force P H acts on the end face 14 of the working piston 15.
  • the communication from P to A in the control device 2 is opened, the communication from B to T is closed.
  • the thrust force P H thus produces a sliding movement of the piston 15 against the return force R which is a rection force on the working tool.
  • the movement performed by the piston 15 in the cylinder 1 is dependent on the return force R. If there is no return force R, the piston 15 is moved by the hydraulic thrust forces P H over the entire piston stroke motion S. In that position, the piston 15 first butts against a mechanical damping means 18. If the piston 15 is moved on by the distance X' against the force of the damping means 18, the piston 15 opens a relief opening 17 which is arranged in the form of an annular groove in the cylinder 1. By way of the relief opening 17, pressure fluid can flow back through the relief conduit 11 directly into the tank conduit 12, by-passing the control device 2.
  • a throttle 24 in the return conduit between the cylinder 1 and the pressure fluid tank 3 produces an increase in pressure in the cylinder 1 even when the communication from B to T in the control device 2 is open, thereby avoiding an abrupt return movement of the piston 15, when subject to high return forces R.
  • FIGS. 2 shows the flow of pressure fluid in the system at the beginning of a working operation, that is to say, when the piston 15 is in the return position.
  • the control device 2 is flanged directly onto one end of the hydraulic cylinder 1.
  • the control device 2 operates in accordance with the per se known principle of a rotary slide valve unit.
  • a rotor 29 which is driven by a drive means not shown in greater detail herein rotates at a given speed which determines the frequency of the hydraulic pulses.
  • feed pockets or recesses 28 and return pockets or recesses 26 which, depending on their respective positions, open and close inlet bores 27 and outlet bores 25 in the housing of the control device 2.
  • the feed pockets 28 open the inlet bores 27 while the rotor 29 closes off the outlet bores 25, as the return pockets 26, in that position, are disposed substantially transversely with respect to the axis of the outlet bores 25.
  • the communication P to A is opened so that the end face 14 of the piston 15 is acted upon the pressure fluid.
  • the control device could also be used, instead of the rotary slide valve principle.
  • the control device could have a control slide member which does not rotate but which performs an exclusively axial movement.
  • the piston itself comprises an actual working piston 15 and a guide piston 23.
  • a portion 30 of reduced diameter is disposed between the working piston 15 and the guide piston 23.
  • Two plate or disc members 21 are axially displaceably mounted on the reduced-diameter portion 30 and disposed between the two members 21 is a spring element 20 which presses the two members 21 away from each other.
  • each disc member 21 On the side remote from the spring element 20, each disc member 21 has an abutment means in the cylinder 1, against which they are pressed by the spring element 20.
  • the disc members 21 and the spring element 20 thus form in a very simple manner a mechanical damping means 18 against which either the annular surface 19 of the working piston or the annular surface 22 of the guide piston can bear.
  • Spacer elements are provided to protect the spring element 20 and to restrict the damping travel X.
  • the spacer elements preferably comprise an annular wall portion which is disposed on each disc member, so that each disc member is of the configuration of a cup-like component. Other spacer elements however can obviously be envisaged.
  • the hydraulic cylinder 1 is provided with an annular groove 16.
  • the annular groove 16 communicates by way of the return conduit 10 with the outlet bores 25 in the control device.
  • the annular groove 16 is arranged in such a way that, even when the piston 15 is in the entirely set-back position, there is a communication between the feed conduit 9 and the return conduit 10.
  • the annular groove 16 can also be omitted if it is not required for reasons of increasing the damping chamber 13.
  • the outlet bores 25 are of reduced diameter, in comparison with the inlet bores 27, so that they act as a throttle means in the flow of pressure fluid.
  • a further annular groove in the cylinder 1 communicates with a relief opening 17 which however is exposed only when the end face 14 has covered the entire piston stroke distance X and when the piston 15 is then additionally moved against the force of the damping means 18.
  • the relief opening 17 carries pressure fluid by way of the vent conduit 11 directly back into the pressure fluid tank, independently of the control position of the control device 2.
  • damping in respect of the return force R is also provided by the mechanical damping means 18 which can still be compressed by the damping distance X before the piston comes into an entirely abutted position.
  • the relief of the stress in the damping means 18 assists the reversal of the movement of the piston, against the return force R.
  • FIG. 3 shows the working piston 15 in that position.
  • the end face 14 of the piston 15 is so arranged relative to the relief opening 17 that, with the working piston 15 in a position of bearing against the damping means, the relief opening 17 still just remains closed.
  • FIG. 4 shows a particularly advantageous use of the above-described pulse hydraulic assembly in relation to an excavator bucket.
  • An excavator bucket 32 is secured to a bucket arm 31, on a arm joint 42.
  • a substantially U-shaped mouth assembly 33 which has two lateral limb portions 34.
  • the limb portions 34 are pivotally secured in the upper region of the bucket, at their upper free ends, by joints 35.
  • the two limb portions 34 are connected together by a connecting portion 36 which on the one hand forms the bucket cutting edge 37 and which on the other hand carries the teeth 38.
  • the bucket 32 has a double bottom structure comprising an upper sheet metal member 39 and a lower sheet metal member 40. Disposed in the double bottom structure are the control device 2 and the hydraulic cylinder 1 which form a respective unit. Depending on the width of the excavator bucket, a plurality of such units may be disposed in a row, one behind the other. Force is transmitted from the piston 15 to the connecting portion 36 of the mouth assembly 33 by way of a joint member 41.
  • the member 41 has two ball joints 47, wherein one ball mounting cup means 48 is disposed on the piston 15 and a second ball mounting cup means 48' is arranged on the connecting portion 36. That pivotal connection provides for satisfactory transmission of the vibratory forces from the piston 15 to the mouth assembly 33 even if the latter tilts or shifts under the effect of maximum loads and resistance to penetration. Therefore, there is no need to take particular steps to stabilize the piston 15.
  • the bucket is not only connected to the bucket arm 31 at the arm joint 42, but is also connected to the lever arm 44 and the elbow lever 45 at the bucket joint 43.
  • the lever 45 is engaged by a bucket cylinder 46 for applying the power for pivoting the bucket about the arm joint 42.
  • the bucket joint 43 is mounted in a metal-rubber element as that part of the arrangement is subjected to the action of reaction forces originating from the vibratory movement of the mouth assembly. Reaction forces and forces exerted by the bucket cylinder 46 are simultaneously transmitted here by way of the bucket joint 43. It has been found particularly advantageous for the lever arm 44 to extend substantially parallel to the bucket arm 31, with the bucket 32 in the basic position.
  • FIG. 5 shows a modified embodiment of a control device wherein in particular the cylinder 1 and the piston 15 are of a different configuration.
  • the piston is provided with a central bore 53 which leads from the end face 14 to a position at the level of an annular groove 55 in the piston.
  • the annular groove in the piston and the central bore intercommunicate by way of communicating bores 54 which extend transversely relative to each other. In that way, the same pressure obtains in the annular groove 55 in the piston, as in front of the end face 14 of the piston.
  • Pressure relief and thus limitation in respect of the maximum stroke movement of the piston occur as soon as the annular groove 55 of the piston reaches the relief opening 17.
  • the pressure fluid then also flows back by way of the relief conduit 11. This construction permits the relief opening 17 to be set back, which may be advantageous from the point of view of the structural length of the piston.
  • the piston when moved back, closes off the return conduit 10 or the annular groove 16.
  • the front end of the piston is provided with a conical facet or bevel portion 56 which prevents the return conduit from being abruptly closed off. It will be appreciated that this embodiment may also be provided with a damping means.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Mining & Mineral Resources (AREA)
  • General Engineering & Computer Science (AREA)
  • Civil Engineering (AREA)
  • Structural Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • Analytical Chemistry (AREA)
  • Chemical & Material Sciences (AREA)
  • Environmental & Geological Engineering (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • General Life Sciences & Earth Sciences (AREA)
  • Geochemistry & Mineralogy (AREA)
  • Geology (AREA)
  • Fluid-Pressure Circuits (AREA)
  • Actuator (AREA)
  • Operation Control Of Excavators (AREA)
US06/717,230 1983-08-06 1984-07-21 Process and apparatus for vibratory operation of a working piston, in particular for active working tools Expired - Lifetime US4715265A (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3328426A DE3328426A1 (de) 1983-08-06 1983-08-06 Arbeitswerkzeug fuer erdbwegungsgeraete
DE3328426 1983-08-06

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US4715265A true US4715265A (en) 1987-12-29

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US06/717,230 Expired - Lifetime US4715265A (en) 1983-08-06 1984-07-21 Process and apparatus for vibratory operation of a working piston, in particular for active working tools

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US (1) US4715265A (fi)
EP (1) EP0153332B1 (fi)
JP (1) JPH0630845B2 (fi)
AU (1) AU565964B2 (fi)
CA (1) CA1237635A (fi)
DE (2) DE3328426A1 (fi)
FI (1) FI87150C (fi)
IT (1) IT1177930B (fi)
WO (1) WO1985000762A1 (fi)
ZA (1) ZA846016B (fi)

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4825960A (en) * 1988-06-30 1989-05-02 Molex Incorporated Synchronized hydraulic hammer arrangement
US4959915A (en) * 1989-03-06 1990-10-02 Caterpillar Inc. Impact bucket apparatus
US5064005A (en) * 1990-04-30 1991-11-12 Caterpillar Inc. Impact hammer and control arrangement therefor
WO1998012389A1 (en) * 1996-09-18 1998-03-26 Odin Ireland Excavation bucket incorporating an impact actuator assembly
US20030209134A1 (en) * 2002-05-07 2003-11-13 Tabor Keith A. Apparatus and method for providing vibration to an appendage of a work vehicle
KR100494072B1 (ko) * 1996-12-05 2005-08-31 가부시키가이샤 고마쓰 세이사쿠쇼 전환밸브장치

Citations (11)

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US2426409A (en) * 1944-03-31 1947-08-26 Chicago Pneumatic Tool Co Distributing valve for percussive tools
US2699756A (en) * 1950-09-15 1955-01-18 Leonidas C Miller Reciprocating pneumatic actuator for tools
US3145488A (en) * 1962-12-26 1964-08-25 Deere & Co Vibrating bucket
DE1634824A1 (de) * 1967-03-11 1971-02-25 Haynes Louis Eduard Vorrichtung zum Ausheben eines Strassenkoffers bzw.zum Ausstechen einer Unterbausohle,eines Planums od.dgl.und zum Graben in der Erde
US3592107A (en) * 1968-06-06 1971-07-13 Lundbergs Mek Brdr Hydraulic control system
DE2008059A1 (de) * 1969-09-04 1971-09-09 Gunther Neumann Hydraulischer pneumatischer und mechaniser Antrieb für oszillierende Bewegungen
DE2552336A1 (de) * 1974-11-22 1976-08-12 Ts Osrodek P K Maszyn Gorniczy Hydraulische schlagmaschine
DE2623639A1 (de) * 1976-05-26 1977-12-08 Kloeckner Humboldt Deutz Ag Hydraulischer schwingungserreger
DE2821339A1 (de) * 1977-05-18 1978-11-30 Takahashi Eng Kk Hydraulische kolbenzylindervorrichtung zur hervorrufung einer axialen kolbenvibration
US4240326A (en) * 1976-02-23 1980-12-23 Koehring Gmbh - Bomag Division Hydraulic vibration exciter and method of cooling thereof
US4590763A (en) * 1983-11-02 1986-05-27 Gtm Entrepose Method of supplying a normally continuous operating hydraulic actuator with hydraulic fluid, continuously and by controlled pulse, and a device for implementing said method

Patent Citations (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2426409A (en) * 1944-03-31 1947-08-26 Chicago Pneumatic Tool Co Distributing valve for percussive tools
US2699756A (en) * 1950-09-15 1955-01-18 Leonidas C Miller Reciprocating pneumatic actuator for tools
US3145488A (en) * 1962-12-26 1964-08-25 Deere & Co Vibrating bucket
DE1634824A1 (de) * 1967-03-11 1971-02-25 Haynes Louis Eduard Vorrichtung zum Ausheben eines Strassenkoffers bzw.zum Ausstechen einer Unterbausohle,eines Planums od.dgl.und zum Graben in der Erde
US3592107A (en) * 1968-06-06 1971-07-13 Lundbergs Mek Brdr Hydraulic control system
DE2008059A1 (de) * 1969-09-04 1971-09-09 Gunther Neumann Hydraulischer pneumatischer und mechaniser Antrieb für oszillierende Bewegungen
DE2552336A1 (de) * 1974-11-22 1976-08-12 Ts Osrodek P K Maszyn Gorniczy Hydraulische schlagmaschine
US4240326A (en) * 1976-02-23 1980-12-23 Koehring Gmbh - Bomag Division Hydraulic vibration exciter and method of cooling thereof
DE2623639A1 (de) * 1976-05-26 1977-12-08 Kloeckner Humboldt Deutz Ag Hydraulischer schwingungserreger
DE2821339A1 (de) * 1977-05-18 1978-11-30 Takahashi Eng Kk Hydraulische kolbenzylindervorrichtung zur hervorrufung einer axialen kolbenvibration
US4590763A (en) * 1983-11-02 1986-05-27 Gtm Entrepose Method of supplying a normally continuous operating hydraulic actuator with hydraulic fluid, continuously and by controlled pulse, and a device for implementing said method

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4825960A (en) * 1988-06-30 1989-05-02 Molex Incorporated Synchronized hydraulic hammer arrangement
AU621841B2 (en) * 1988-06-30 1992-03-26 Caterpillar Inc. Synchronized hydraulic hammer arrangement
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US5064005A (en) * 1990-04-30 1991-11-12 Caterpillar Inc. Impact hammer and control arrangement therefor
WO1991017023A1 (en) * 1990-04-30 1991-11-14 Caterpillar Inc. Impact hammer and control arrangement therefor
WO1998012389A1 (en) * 1996-09-18 1998-03-26 Odin Ireland Excavation bucket incorporating an impact actuator assembly
KR100494072B1 (ko) * 1996-12-05 2005-08-31 가부시키가이샤 고마쓰 세이사쿠쇼 전환밸브장치
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Also Published As

Publication number Publication date
DE3468339D1 (en) 1988-02-11
IT8448624A0 (it) 1984-07-24
FI87150B (fi) 1992-08-31
JPH0630845B2 (ja) 1994-04-27
IT1177930B (it) 1987-08-26
FI851392L (fi) 1985-04-04
CA1237635A (en) 1988-06-07
FI87150C (fi) 1992-12-10
EP0153332A1 (de) 1985-09-04
AU3157884A (en) 1985-03-12
DE3328426A1 (de) 1985-02-21
JPS60501959A (ja) 1985-11-14
FI851392A0 (fi) 1985-04-04
WO1985000762A1 (en) 1985-02-28
EP0153332B1 (de) 1988-01-07
ZA846016B (en) 1985-04-24
AU565964B2 (en) 1987-10-01

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